680 THE GEOLOGY OP CYEENA1CA. [Nov. I9II, 



Mediterranean areas. He noted with interest the close structural 

 and palaeontological connexions. The main lines were apparently 

 similar to those which affected the areas bordering the Red Sea, as 

 well as the districts surrounding the Eastern Mediterranean. He 

 noted also with satisfaction the further evidence of an extension of 

 a North African land-area in Middle Tertiary times. The chain of 

 evidence had now been carried from Western Egypt, through 

 Cyrenaica, Crete, and Cyprus, and probably farther eastwards. 



Prof. Gregory explained that he had searched for terrestrial 

 deposits, but the whole series was of marine origin ; and any western 

 continuation of the terrestrial Upper Eocene beds of Egypt must be 

 looked for to the south of the area that he had visited. 



The Cyrenaican fractures were part of a series which had affected 

 a vast area south and south-east of the fold-mountains of the Atlas 

 and the Apennines. The Cyrenaican beds had a gentle dip to the 

 east, and the country might be described as part of one limb of the 

 geosyncline of Western Egypt ; but the lowering of the Miocene 

 limestone from the summit of the plateau of Cyrenaica to sea-level 

 on the Libyan coast, and of the Derna Limestone (the representative 

 of the Mokattam Series) to a low level in Egypt was aided by 

 a succession of step-faults. In regard to the problem raised by 

 Dr. Teall, he agreed with Suess that the difference in level could 

 be better explained by the subsidence of Egypt, rather than by the 

 uplift of Cyrenaica. 



